[OMPI users] Bandwidth efficiency advice

Dear All, I would appreciate some general advice on how to efficiently implement the following scenario. I am looking into how to send a large amount of data over IB _once_, to multiple receivers. The trick is, of course, that while the ping-pong benchmark delivers great bandwidth, it does s

Re: [OMPI users] Bandwidth efficiency advice

If you have multiple receivers then use MPI_Bcast, it does all the necessary optimizations such that MPI users do not have to struggle to adapt/optimize their application for a specific architecture/network. George. On Fri, May 26, 2017 at 6:43 AM, marcin.krotkiewski < marcin.krotkiew...@gmai

[OMPI users] pmix, lxc, hpcx

Hi, I have built openmpi 2.1.1 with hpcx-1.8 and tried to run some mpi code under ubuntu 14.04 and LXC (1.x) but I get the following: [ib7-bc2oo42-be10p16.science.gc.ca:16035] PMIX ERROR: OUT-OF-RESOURCE in file src/dstore/pmix_esh.c at line 1651 [ib7-bc2oo42-be10p16.science.gc.ca:16035] PMIX E

Re: [OMPI users] pmix, lxc, hpcx

Hi John, In the 2.1.x release stream a shared memory capability was introduced into the PMIx component. I know nothing about LXC containers, but it looks to me like there's some issue when PMIx tries to create these shared memory segments. I'd check to see if there's something about your contain

Re: [OMPI users] pmix, lxc, hpcx

You can also get around it by configuring OMPI with “--disable-pmix-dstore” > On May 26, 2017, at 3:02 PM, Howard Pritchard wrote: > > Hi John, > > In the 2.1.x release stream a shared memory capability was introduced into > the PMIx component. > > I know nothing about LXC containers, but it

[OMPI users] Problems with IPoIB and Openib

I have been having some issues with using openmpi with tcp over IPoIB and openib. The problems arise when I run a program that uses basic collective communication. The two programs that I have been using are attached. *** IPoIB *** The mpirun command I am using to run mpi over IPoIB is, mpiru